HR1001A

HR1001A

Enhanced LLC Controller with Adaptive Dead-Time Control

Datasheet

Description

The HR1001A is the OCP auto-recovery version of the HR1001B. The HR1001A is an enhanced LLC controller, and provides new features including adaptive dead-time adjustment (ADTA) and capacitive mode protection (CMP). Adaptive dead-time adjustment inserts a dead time between the two complimentary gate outputs automatically. This is ensured by keeping the outputs off while sensing the dV/dt current of the half-bridge switching node. The ADTA features easier design, lower EMI, and higher efficiency.

The HR1001A incorporates anti-capacitive mode protection, which prevents potentially destructive capacitive mode switching if the output is shorted or has a severe overload. This feature protects the MOSFET during abnormal conditions, making the converter robust. The HR1001A has a programmable oscillator that sets both the maximum and minimum switching frequencies. It starts up at a programmed maximum switching frequency, and decays until the control loop takes over to prevent excessive inrush current. The HR1001A enters a controlled burst mode at light-load to minimize power consumption and tighten output regulation.

The device provides rich protection features, including two-level OCP, auto-recovery, external latch shutdown, brown-in/out, CMP, and OTP, improving converter design safety with minimal external components.

Features & Benefits

Two-Level Over-Current Protection: Frequency Shift and Auto-Recovery Mode with Programmable Duration Time
Adaptive Dead-Time Adjustment
Capacitive Mode Protection
50% Duty Cycle, Variable Frequency Control for Resonant Half-Bridge Converter
600V High-Side Gate Driver with Integrated Bootstrap Diode with High dV/dt Immunity
High-Accuracy Oscillator
Operates Up to 600kHz
Latched Disable Input for Easy Protection
Remote On/Off Control and Brown-Out Protection through BO
Programmable Burst Mode Operation at Light Load
Nonlinear Soft Start for Monotonic Output Voltage Rise
Available in an SOIC-16 Package